code: def test_serialize_databounds(self):
      viewport = maps.InitialViewport.from_data_bounds()
      expected = {"type": "DATA_BOUNDS"}
      assert maps._serialize_viewport(viewport, None) == expected
  
file_path: gmaps/gmaps/tests/test_maps.py
imports: import unittest
  import traitlets
  from ..None import maps, heatmap_layer
label_desc: Use image node_id 1 for calling the SerializeViewport obj's underlying member method code with example usage: obj.test_serialize_databounds() without return types